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Vercel Deno Runtime (vercel-deno)

The Deno Runtime compiles a TypeScript or JavaScript function into a serverless function powered by Deno, running on Vercel.


Create a file called api/hello.ts with the following contents:

import { ServerRequest } from '';

export default async (req: ServerRequest) => {
	req.respond({ body: `Hello, from Deno v${Deno.version.deno}!` });

Next, define the vercel-deno runtime within the "functions" object in your vercel.json file:

	"functions": {
		"api/**/*.[jt]s": { "runtime": "vercel-deno@0.6.1" }


Note: Be sure to place the vercel.json file in the root directory of your project.


There are a few build environment variables that you may configure for your serverless functions:

Name Description Default
DEBUG Enables additional logging during build-time. false
DENO_TSCONFIG Passes the --config flag to specify a tsconfig.json file that Deno will use. None
DENO_UNSTABLE Passes the --unstable flag to deno cache (at build-time) and deno run (at runtime). false
DENO_VERSION Version of deno that the serverless function will use. 1.2.2


The vercel dev command is supported on Windows, macOS, and Linux:

  • Vercel CLI v19.1.0 or newer is required.
  • Uses the deno binary installed on the system (does not download deno).
  • Specifying a specific version of Deno via DENO_VERSION env var is not supported.
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